fix(report): use the upstream reader edition for new longform bodies

New reports request reader_main from upstream origin/main 23b9609e.
KP and transit no longer copy an empty vars() dict, solar returns keep
birth_asc_sign_idx, and ordinary projection deletes internal lines whole.

tests/test_report_longform_parity.py

@@ -64,12 +64,12 @@ def test_reading_navigation_emits_required_headings() -> None:
     for heading in (
         "## 成品阅读导航",
         "### 先读什么",
-        "### 结论等级规则",
         "### 专题判读协议",
         "### 质量验收矩阵",
         "### 对照覆盖表",
     ):
         assert heading in markdown
+    assert "### 结论等级规则" not in markdown
     assert "| 三年年度展开 | present |" in markdown
     assert "| KP 三年流月支持 | present |" in markdown